Two Vital Functions of the Cell (P

NAME: ______H.R: ______DATE: ______

SCI & TECH 204

The Living World SECTION 3: Life Sustaining Processes

NOTE-TAKING WORKSHEET

Two Vital Functions of the Cell (p. 284-285)

·  Cells get the energy they need to grow and function from the food they consume.

·  Energy contained in the food is released during a chemical reaction called cellular respiration.

·  Plants produced their food themselves with a function called photosynthesis.

Complete the table below.

Photosynthesis

·  Plants use sunlight as an energy source to manufacture carbohydrates from carbon dioxide and water.

·  The water comes from the roots.

·  The leaves absorb carbon dioxide present in the air.

·  Photosynthesis is very important because carbohydrates are at the root of everything that living organisms eat.

Draw an input/output diagram of photosynthesis.

Cellular Respiration

·  Cellular respiration transforms carbohydrates into energy.

·  The mitochondria in the cell absorb carbohydrates and oxygen releasing energy in a chemical reaction.

Draw an input/output diagram of cellular respiration.

In the space below, answer # 6 & 7 from the Memory Check (p. 285)

6. Similarities:

·  The same substances are involved in both processes (water, carbohydrates, carbon dioxide, and oxygen).

·  Both processes involve energy.

·  Both processes involve chemical reactions.

Differences:

·  In photosynthesis, carbohydrates are being produced and stored. While in cellular respiration, carbohydrates are being used to produce oxygen.

·  In photosynthesis, carbon dioxide is consumed and oxygen is produced. In cellular respiration, oxygen in consumed and carbon dioxide is produced.

·  Photosynthesis requires sunlight while cellular respiration does not.

7. Trees are called the lungs of the Earth because they “breathe” in a way similar to animals. During the day they produce oxygen (photosynthesis occurs), while at night they produce carbon dioxide (cellular respiration occurs).

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